Crack the "black hole effect" and "flicker effect" How to design tunnel lighting? (with video)

Tunnel lighting is one of the most common applications in outdoor lighting. It must be improved during the day or night, and the main problem is not generated in nighttime lighting, but in the daytime.

In daylight daylight, the brightness inside and outside the tunnel varies greatly, especially in long tunnels. The lighting system should provide a reasonable level of brightness, to solve the visual adaptation of the driver from the bright environment into the dark environment, and then return to the bright environment from the dark environment. problem.

Therefore, the purpose of lighting is to ensure that when the vehicle approaches, passes through and leaves the tunnel at a certain speed, the safety and comfort felt during driving should be no less than the feeling of driving on the open road connected to the tunnel. .

Second, we also need to understand the two main phenomena that appear in the two tunnel lighting:

Black hole effect

That is, at the entrance of the tunnel or in the tunnel, the illumination brightness is too low, and there is not enough adaptation time, so that the tunnel seen by the driver when approaching the tunnel under high brightness outdoors is like a "black hole".

Recently, the “Lightway Environment and Coping Technology Research of Mountain Expressway Tunnels” led by Guizhou Expressway Group not only solved this problem, but also obtained national invention patents. At the same time, the energy-saving benefits of this technology are also obvious.


Normally, the driver drives into the tunnel, which creates a black hole effect on the left side of the picture. The picture on the right does not have this situation. This is the Panling Tunnel on the Sanping-Liping Expressway. It is the two probes and their control systems at the tunnel entrance that break the "black hole effect".


The two cameras collect color temperature data from the outside for one day, and the other is the intensity data for collecting light on the ground. Combine these two data into our control system and issue commands through the control system. Adjust the color temperature and intensity of the lamps in the tunnel to the outside.

The tunnel light that is automatically adjusted by this system will be consistent with the outside light. It is the brightest white at noon, and the warm warm yellow in the morning and evening. ——Zhongnan Transportation Technology Co., Ltd.


After entering the tunnel, it is clear at a glance. When the other tunnels enter, there will be a blackout of a few tenths of a second. ——Driver Li Zhixiang

3D printing on the pen machine is mainly used in 3 d printing pen, is made from a special custom Dc Gear Motor, mainly used in 3 d printing pen, pen 3 d printing machine has been updated three generations according to the requirements of product.

3D Printing Motor product introduction:

The 3D Printing Motor is based on the deceleration Motor, coupled with supporting gears and ball bearings.The role of the gear reducer is to provide lower speed and greater torque.At the same time, gear box different deceleration ratio can provide different speed and torque.It's mostly rolling.

3D Printing Motor

     3D Printing Motor3D Printing Motor

Features: 3D Printing Motor, small size, large torque, low noise, durable, low energy consumption, customized power design, convenient installation and maintenance;

Simplify design and save space.

Features: usually used financial equipment, office equipment, electronic locks, wireless charger, remote control toys, precision instruments and meters, automobile industry, medical equipment, consumer electronics, household appliances, electric glass doors and Windows, etc., wide application range

Method of use: the best stable in horizontal plane, installed on the 3D Printing Motor output shaft parts, cannot use a hammer to knock, knock prone to press into the 3D Printing Motor drive, may cause damage to internal components, and cannot be used in the case of blocked.

3D Printing   3D Printing

Operating temperature range:

3D Printing Motor should be used at a temperature of -10~60℃.

The figures stated in the catalog specifications are based on use at  ordinary room temperature catalog specifications re based on use at ordinary room temperature  (approximately20~25℃.

If a 3D Printing Motor is used outside the prescribed temperature range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.Depending on the temperature conditions ,it may be possible to deal with them by changing the grease of the motor's parts.Please feel free to consult with us about this.

Storage temperature range:

3D Printing Motor should be stored ta a temperature of -15~65℃.

In case of storage outside this range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.

Service life:

The longevity of 3D Printing Motor is greatly affected by the load conditions , the mode of operation,the environment of use ,etc.Therefore,it is necessary to check the conditions under which the product will actually be used .The following conditions will have a negative effect on longevity.Please consult with us should any of them apply.

●Use with a load that exceeds the rated torque

●Frequent starting

●Momentary reversals of turning direction

●Impact loads

●Long-term continuous operation

●Forced turning using the output shaft

●Use in which the permitted overhang load or the permitted thrust load is exceeded

●A pulse drive ,e.g.,a short break,counter electromotive force,PWM control

●Use of a voltage that is nonstandard as regards the rated voltage

●Use outside the prescribed temperature or relative-humidity range,or in a special environment.

●Please consult with us about these or any other conditions of use that may apply,so that we can be sure that you select the most appropriate model.

when it come to volume production,we're a major player as well .each month,we rurn out  600000 units,all of which are compliant with the rohs directive.Have any questions or special needed, please contact us, we have the engineer group and best sales department to service to you Looking forward to your inquiry. Welcome to our factory.

3D Printing Motor

3D Printing Motor

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